What is the process called that systematically uses the information signal to vary a parameter of the carrier signal?

The process being described is modulation, which is the technique used to adjust a carrier signal in accordance with the information signal. This adjustment can involve changing various parameters of the carrier wave, such as its amplitude, frequency, or phase, to encode the information being transmitted. By doing this, the information can be effectively sent over long distances, allowing for efficient communication.

Understanding modulation is crucial in various applications, including radio communications and digital data transmission, where it allows for a clearer and more robust signal that can be sent and received accurately. The modulation process enables the transformation of data into a form suitable for transmission, making it essential to modern communication systems.